全文获取类型
收费全文 | 978篇 |
免费 | 48篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 19篇 |
综合类 | 1篇 |
化学工业 | 215篇 |
金属工艺 | 15篇 |
机械仪表 | 14篇 |
建筑科学 | 101篇 |
矿业工程 | 2篇 |
能源动力 | 23篇 |
轻工业 | 100篇 |
水利工程 | 5篇 |
石油天然气 | 1篇 |
无线电 | 88篇 |
一般工业技术 | 176篇 |
冶金工业 | 63篇 |
原子能技术 | 16篇 |
自动化技术 | 189篇 |
出版年
2023年 | 14篇 |
2022年 | 23篇 |
2021年 | 29篇 |
2020年 | 11篇 |
2019年 | 13篇 |
2018年 | 13篇 |
2017年 | 16篇 |
2016年 | 36篇 |
2015年 | 23篇 |
2014年 | 28篇 |
2013年 | 59篇 |
2012年 | 41篇 |
2011年 | 81篇 |
2010年 | 57篇 |
2009年 | 58篇 |
2008年 | 57篇 |
2007年 | 57篇 |
2006年 | 48篇 |
2005年 | 46篇 |
2004年 | 34篇 |
2003年 | 25篇 |
2002年 | 24篇 |
2001年 | 16篇 |
2000年 | 13篇 |
1999年 | 13篇 |
1998年 | 22篇 |
1997年 | 24篇 |
1996年 | 11篇 |
1995年 | 15篇 |
1994年 | 8篇 |
1993年 | 7篇 |
1992年 | 6篇 |
1990年 | 8篇 |
1989年 | 8篇 |
1988年 | 3篇 |
1985年 | 3篇 |
1983年 | 3篇 |
1982年 | 5篇 |
1981年 | 4篇 |
1979年 | 5篇 |
1978年 | 3篇 |
1977年 | 5篇 |
1976年 | 9篇 |
1975年 | 4篇 |
1973年 | 4篇 |
1971年 | 3篇 |
1970年 | 3篇 |
1965年 | 5篇 |
1962年 | 2篇 |
1937年 | 2篇 |
排序方式: 共有1028条查询结果,搜索用时 11 毫秒
1.
Dr. Tomasz Ratajczyk Prof. Dr. Gerd Buntkowsky Dr. Torsten Gutmann Dr. Bartłomiej Fedorczyk Dr. Adam Mames Dr. Mariusz Pietrzak Zuzanna Puzio Piotr Grzegorz Szkudlarek 《Chembiochem : a European journal of chemical biology》2021,22(5):855-860
The biorelevant PyFALGEA oligopeptide ligand, which is selective towards the epidermal growth factor receptor (EGFR), has been successfully employed as a substrate in magnetic resonance signal amplification by reversible exchange (SABRE) experiments. It is demonstrated that PyFALGEA and the iridium catalyst IMes form a PyFALGEA:IMes molecular complex. The interaction between PyFALGEA:IMes and H2 results in a ternary SABRE complex. Selective 1D EXSY experiments reveal that this complex is labile, which is an essential condition for successful hyperpolarization by SABRE. Polarization transfer from parahydrogen to PyFALGEA is observed leading to significant enhancement of the 1H NMR signals of PyFALGEA. Different iridium catalysts and peptides are inspected to discuss the influence of their molecular structures on the efficiency of hyperpolarization. It is observed that PyFALGEA oligopeptide hyperpolarization is more efficient when an iridium catalyst with a sterically less demanding NHC ligand system such as IMesBn is employed. Experiments with shorter analogues of PyFALGEA, that is, PyLGEA and PyEA, show that the bulky phenylalanine from the PyFALGEA oligopeptide causes steric hindrance in the SABRE complex, which hampers hyperpolarization with IMes. Finally, a single-scan 1H NMR SABRE experiment of PyFALGEA with IMesBn revealed a unique pattern of NMR lines in the hydride region, which can be treated as a fingerprint of this important oligopeptide. 相似文献
2.
3.
Torsten Söderström 《Circuits, Systems, and Signal Processing》2002,21(1):83-90
This paper gives a tutorial overview of basic approaches for model validation and model structure determination.Work partially supported by the Swedish Research Council for Engineering Sciences under contract 98-654. 相似文献
4.
In recent years, a wide range of generalized barycentric coordinates has been suggested. However, all of them lack control over derivatives. We show how the notion of barycentric coordinates can be extended to specify derivatives at control points. This is also known as Hermite interpolation. We introduce a method to modify existing barycentric coordinates to higher order barycentric coordinates and demonstrate, using higher order mean value coordinates, that our method, although conceptually simple and easy to implement, can be used to give easy and intuitive control at interactive frame rates over local space deformations such as rotations. 相似文献
5.
Torsten Bohlin Stefan F. Graebe 《International Journal of Adaptive Control and Signal Processing》1995,9(6):465-490
Grey box identification refers to the practice of identifying dynamical systems in model structures exploiting partial prior information. This contribution reviews a method for stochastic grey box identification and surveys experiences and lessons of applying it to a number of industrial processes. Issues to be addressed include advantages and costs of introducing stochastics into the model, the question of what contribution must be expected from the model designer as opposed to what can be formalized in computer algorithms, and an outlook on future plans to resolve present shortcomings. 相似文献
6.
Yan T Wong Norbert Dommel Philip Preston Luke E Hallum Torsten Lehmann Nigel H Lovell Gregg J Suaning 《IEEE transactions on neural systems and rehabilitation engineering》2007,15(3):425-434
A neurostimulator application-specific integrated circuit (ASIC) with scalable circuitry that can stimulate 14 channels, has been developed for an epi-retinal vision prosthesis. This ASIC was designed to allow seven identical units to be connected to control up to 98 channels, with the ability to stimulate 14 electrodes simultaneously. The neurostimulator forms part of a vision prosthesis, designed to restore vision to patients who have lost their sight due to retinal diseases such as retinitis pigmentosa and macular degeneration. For charge balance, the neurostimulator was designed to stimulate with current sources and sinks operating together, and with the ability to drive a hexagonal mosaic of electrodes to reduce the electrical crosstalk that occurs when multiple bipolar stimulation sites are active simultaneously. A hexagonal mosaic of electrodes surrounds each stimulation site and has been shown to effectively isolate each site, increasing the ability to inject localized independent charge into multiple regions simultaneously. 相似文献
7.
The roles of FPGAs in reprogrammable systems 总被引:3,自引:0,他引:3
Hauck S. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1998,86(4):615-638
Reprogrammable systems based on field programmable gate arrays are revolutionizing some forms of computation and digital logic. As a logic emulation system, they provide orders of magnitude faster computation than software simulation. As a custom-computing machine, they achieve the highest performance implementation for many types of applications. As a multimode system, they yield significant hardware savings and provide truly generic hardware. In this paper, we discuss the promise and problems of reprogrammable systems. This includes an overview of the chip and system architectures of reprogrammable systems as well as the applications of these systems. We also discuss the challenges and opportunities of future reprogrammable systems 相似文献
8.
We propose a method for non-uniform reconstruction of 3D scalar data. Typically, radial basis functions, trigonometric polynomials or shift-invariant functions are used in the functional approximation of 3D data. We adopt a variational approach for the reconstruction and rendering of 3D data. The principle idea is based on data fitting via thin-plate splines. An approximation by B-splines offers more compact support for fast reconstruction. We adopt this method for large datasets by introducing a block-based reconstruction approach. This makes the method practical for large datasets. Our reconstruction will be smooth across blocks. We give reconstruction measurements as error estimations based on different parameter settings and also an insight on the computational effort. We show that the block size used in reconstruction has a negligible effect on the reconstruction error. Finally we show rendering results to emphasize the quality of this 3D reconstruction technique. 相似文献
9.
10.
Daun Marian Brings Jennifer Krajinski Lisa Stenkova Viktoria Bandyszak Torsten 《Requirements Engineering》2021,26(3):325-370
Requirements Engineering - Collaborative cyber-physical systems are capable of forming networks at runtime to achieve goals that are unachievable for individual systems. They do so by connecting to... 相似文献